Ground state of superheavy elements with $120\le Z\le 170$: Systematic study of the electron-correlation, Breit, and QED effects

For superheavy elements with atomic numbers $120\le Z\le 170$, the concept of the ground-state configuration is being reexamined. To this end, relativistic calculations of the electronic structure of the low-lying levels are carried out by means of the Dirac-Fock and configuration-interaction methods. The magnetic and retardation parts of the Breit interaction as well as the QED effects are taken into account. The influence of the relativistic, QED, and electron-electron correlation effects on the determination of the ground state is analyzed.

Figure 1

Relativistic-configuration-average energies $E_{\mathrm{RAV}}^{\mathrm{DCBQ}}$ calculated for the configurations $8p_{1/2}^{1}6f_{5/2}^{3}5g_{7/2}^1$ (left) and $8p_{1/2}^{1}7d_{3/2}^{1}6f_{5/2}^{2}5g_{7/2}^1$ (right) of the SHE with $Z=125$ and all the possible levels which contribute to these average energies. For the lowest DCBQ-SRC levels the total angular momentum quantum numbers $J$ are shown.